RU2722887C1 - Safety device for transportation of spent gamma-chamber fuel assemblies - Google Patents

Abstract

FIELD: nuclear energy.SUBSTANCE: invention relates to nuclear power engineering and can be used primarily for transportation of spent gamma-chamber fuel assemblies in protective chambers of separation compartments. Safety device comprises bearing barrel (1) and safety seat (2) consisting of bracket (9), case (10) and locking lever (11), and flexible connections (3) between bearing barrel (1) and safety seat (2).EFFECT: prevention of falling of gamma-chamber SFA in case of separation of the rod from the central rod.10 cl, 7 dwg

Description

The invention relates to the field of nuclear energy and can be used mainly for transportation of spent gamma-chamber fuel assemblies (hereinafter referred to as gamma-chamber SFAs) in the protective chambers of cutting departments.

When working with gamma-chamber SFAs in the protective chambers of the cutting compartments, situations arise when, due to corrosion processes in the weld, the rod of the gamma-chamber SFA can break off from the central rod and the gamma-chamber SFA can drop further.

In the event that the rod breaks off during the supply of the gamma-chamber SFA to the protective chamber, the gamma-chamber SFA falls into a case equipped with a damping device. In the case of a detachment of the rod after the gamma-chamber SFA is fed into the protective chamber, the drop occurs on the bottom of the protective chamber, which can lead to damage to the bottom, equipment of the protective chamber, destruction of the gamma-chamber SFA itself and, as a result, the fuel elements spill.

Known gripping device for transporting goods with a figured head (patent RU No. 2034770 В66С 1/66, publ. 05/10/1995), containing gripping balls located in the radial holes of the guide, the device is equipped with locking balls located in the holes of the housing and interacting with an additional sleeve . This device allows you to lift the gamma-chamber SFAs, holding the latter only by the curly heads of the rods, and in the case of a detachment of the rod is not able to prevent the fall of the gamma-chamber SFAs.

Known gripping device (patent RU No. 2525191 ВСС 1/66, publ. 08/10/2014 Bull. No. 22) contains a housing made with a control mechanism in the form of a control cam with curly grooves, with a core and rods for opening the device, gripping elements made in the form of rotary rods, at their respective ends there are crackers for "grasping" the SFA head, a flange for abutting against the housing flange and rollers on the axles with the possibility of moving along the figured grooves. In the lower part of the grooves, a trapping unit is installed, which limits the bending of the rotary rods in case of “undermining”. The gripping device is made with a central channel for passing the device through the covers of the control and protection system. Overcoming a significant buoyancy force when immersing the gripping device in the coolant, reducing the volume of the immersed elements, removing the control mechanisms of the device from the coolant zone, monitoring the state (closed or open) of the device, preventing the gripping elements from turning around their own axis and increasing the reliability of operation. This device does not allow holding the gamma-chamber SFA by the end (power) gratings, since grabbing the gamma-chamber SFA by the grating in the fuel element zone can lead either to damage to the fuel rods (in the case of insufficient clearance between the crackers of the device and the fuel rods), or to the device slipping off gamma-chamber SFA (in case of excessive clearance). Retention of the gamma-chamber SFA by the lattice in the intervals between the fuel rods is impossible due to the lack of free space for the turn of crackers. Holding the gamma-chamber SFAs behind the shaped heads of the rods does not prevent the fall of the gamma-chamber SFAs when the rods are torn off.

Known gripping device and a mechanism for controlling the position of the gripping levers used in it (patent RU No. 2540977 G21C 19/00, publ. 02/10/2015 Bull. No. 4). The gripping device comprises an elongated massive body with a longitudinal channel, in which a movable rod is placed, a locking assembly at the upper end of the housing, fixing the position of the rod in the housing, and a FA assembly at the lower end of the gripper. The rod is made with a longitudinal channel along the axis of the rod for the cover of the control and protection system. The gripping unit comprises a receiving cone at the lower end of the rod for orienting the gripping unit relative to the counterpart on the load, gripping arms pivotally mounted on the lower end of the rod, and a mechanism for controlling the position of the gripping levers. The technical result is the expansion of the technological capabilities of the gripper, increasing the reliability of the work. This device does not allow holding the gamma-chamber SFA by the end (power) gratings, since grabbing the gamma-chamber SFA by the grating in the fuel element zone can lead either to damage to the fuel rods (in the case of insufficient clearance between the device levers and fuel rods), or to the device slipping off gamma-chamber SFA (in case of excessive clearance). Holding the gamma-chamber SFAs behind the shaped heads of the rods does not prevent the fall of the gamma-chamber SFAs when the rods are torn off.

Thus, the known gripping devices mentioned above, used for transporting SFAs, do not provide protection for gamma-chamber SFAs from falling in the event of a detachment of the rod.

Analogues of devices that prevent the fall of gamma-chamber SFAs in the event of a detachment of the rod from the central rod are not identified.

The problem solved by the invention is to develop a safety device design that prevents the fall of gamma-chamber SFAs in the event of a detachment of the rod from the central rod.

When using the invention, the following technical results are achieved:

- ease of installation of the carrier glass of the device on the rod of the gamma-chamber SFA;

- ensuring the fixing of the carrier glass of the device on the rod of the gamma-chamber SFA and preventing spontaneous falling of the glass from the rod of the gamma-chamber SFA;

- compact placement of the device during storage and before installation on a gamma-chamber SFA;

- prevention of damage to the gamma-chamber SFA by a safety socket;

- prevention of spontaneous opening of the flap of the safety socket;

- ease of maintenance of the device;

- increase the radiation safety of protective chambers. The solution of the problem, allowing to achieve the effect with

the specified technical characteristics is a safety device comprising: a carrier glass, a safety socket, consisting of a bracket, a sash and a locking lever, and flexible connections between the carrier glass and the safety socket.

In the particular case of implementation, the carrier glass is made with a fixing step, a radial groove, the width of which exceeds the diameter of the rod of the gamma-chamber SFA, and a neck for capturing the copy manipulator.

In the particular case of implementation, the flexible connections between the carrier glass and the safety socket are made in the form of chains.

In the particular case of the implementation of the flexible connection to attach to the carrier glass and the safety nest using carbines.

In the particular case of the implementation, the flap of the safety socket must be mounted on the bracket of the safety socket with the possibility of rotation in the horizontal plane.

In the particular case of the implementation, the bracket of the safety socket must be made with a step under the end (power) grid of the upper beam of fuel elements (fuel elements) of the gamma-chamber SFA and with emphasis for the shutter of the safety socket.

In the particular case of the implementation, the locking lever of the flap of the safety socket is mounted on the flap using a screw-nut pair and is made with a counterweight.

In the particular case of the implementation, the elements of the safety socket intended for attaching flexible connections are to be carried out with the necks under the grip of the copying manipulator.

The technical result from the application of the proposed design of the safety device is as follows.

The implementation of the carrier glass with a radial groove, the width of which exceeds the diameter of the rod of the gamma-chamber SFA, allows you to put the glass on the rod of the gamma-chamber SFA, moving it horizontally, and does not require "dragging" the glass through the entire rod, thereby ensuring ease of installation using the copy manipulator of the protective chamber.

The implementation of the carrier glass with a fixing step ensures that the glass is fixed on the collar of the rod of the gamma-chamber SFA and prevents its spontaneous falling from the rod, including during seismic influences.

The implementation of the carrier glass with a neck for capturing the copying manipulator allows you to abandon additional devices for dressing (removing) the glass on the rod of the gamma-chamber SFA, thereby ensuring ease of use.

The implementation of flexible connections between the carrier cup and the safety socket, for example, in the form of chains, allows you to place the device on the bottom of the protective chamber directly above the receptacle of the gamma-chamber SFA, provides a compact device for storage and simplifies the deactivation of the device.

The attachment of flexible connections to the carrier glass and the safety socket, for example, using carabiners, allows, if necessary, the replacement of the carrier glass or safety socket directly in the protective chamber, thereby ensuring ease of maintenance.

Installation of the flap of the safety socket with the possibility of rotation in the horizontal plane prevents its spontaneous closure, thereby providing ease of use.

The implementation of the brace of the safety nest with a ledge under the end (power grate) and an emphasis for the sash of the socket ensures the gamma-chamber SFA is grasped by the end grate, eliminates the need to squeeze the gamma-chamber SFA to provide the friction force necessary for holding, and thus eliminates damage to the gamma-chamber SFA.

Installing the locking lever on the leaf using a screw-nut pair and performing it with a counterbalance ensure reliable locking of the leaf and the impossibility of its spontaneous opening.

The implementation of the elements of the safety nests, designed to connect flexible connections, with the necks to capture the copy manipulator, allows you to abandon additional devices for dressing (removing) the nests on the gamma-chamber SFA, thereby ensuring ease of use.

The invention is illustrated by the drawings shown in FIG. 1 ÷ 7:

FIG. 1 - general view of the device;

FIG. 2 - view A;

FIG. 3 - section BB;

FIG. 4 - section bb;

FIG. 5 - section GG;

FIG. 6

FIG. 7 is a view of a device mounted on a gamma-chamber SFA.

The safety device (Fig. 1) contains a carrier glass 1, a safety socket 2 and flexible connections 3, for example, chains attached to the safety socket and the carrier glass, for example, using carabiners 4.

The carrier glass 1 is made with holes 5 (Fig. 1) intended for attaching flexible connections 3, for example, using carabiners 4, a groove 6 (Fig. 2), a fixing step 7 and a neck 8 (Fig. 3), designed to hold carrier glass by grabbing the copy manipulator.

The safety socket 2 (Fig. 1) contains a bracket 9, a sash 10 mounted on the bracket 9 with the possibility of rotation in the horizontal plane, and a locking lever 11 (Fig. 2) mounted on the sash using a pair of "screw-nut" 24 (Fig. . 4).

The bracket 9 of the safety socket 2 is made with a step 13 (Fig. 3), an emphasis 14 (Fig. 4), a groove 15 (Fig. 4) and elements 16 (Fig. 3) for connecting, for example, carbines 4. Elements 16 are made with necks 17 (Fig. 3), designed to hold the safety socket by capturing the copy manipulator.

The flap 10 of the safety socket 2 is mounted on the bracket 9 using the axis 18 (Fig. 5) and has the ability to rotate in the horizontal plane. Finger 12 is fixed on the sash, made with thread 19 (Fig. 4).

The locking lever 11 is made with a thread 20, with the help of which it is installed on the finger 12 of the sash 10, the counterweight 21 and the flat 22 (Fig. 4).

The operation of the safety device is as follows. The safety device is placed on the bottom of the protective chamber (in the particular case, on the cover of the gamma-chamber SFA reception). The spent fuel assembly is fed into the protective chamber until the collar 23 of the gamma-chamber SFA rod appears above the bottom of the protective chamber (Fig. 6). Using a copy manipulator (not shown), the carrier glass is put on the rod of the gamma-chamber SFA through the groove 6 and lowered into the shoulder 23 of the rod until it stops. The fixing step 7 of the carrier glass prevents the latter from sliding off the rod of the gamma-chamber SFA.

The rise of the gamma-chamber SFA with the supporting cup of the safety device installed on its rod continues until the end (power) grating of the upper bundle of gamma-chamber SFA fuel elements appears above the bottom of the protective chamber. Using the copy manipulator (not shown), the safety slot 2 is put on the upper bundle of fuel elements of the gamma-chamber SFA (the shutter 10 of the slot is open). A copy manipulator (not shown), the shutter 10 of the socket 2 is rotated to the stop 14, and the locking lever 11 is rotated counterclockwise. In this case, the lever moves along the thread 20 and the flat 22 of the lever 11 is pressed against the front surface of the groove 15 of the bracket 9 of the safety socket 2, preventing the flap 10 from opening spontaneously. The counterweight 21 prevents the lever 11 from turning clockwise. In case of breakage of the rod of the gamma-chamber SFA, the movement of the upper bundle of fuel rods will be stopped by the step 13 of the bracket 9 of the safety socket 2 and thus the fall of the gamma-chamber SFA will be prevented (Fig. 7).

Claims (10)

1. A safety device for transporting spent gamma-chamber fuel assemblies that prevents the gamma-chamber SFA from falling in the event of a rod break, characterized in that it contains a carrier glass, a safety nest consisting of a bracket, a sash and a locking lever, and flexible couplings attached to safety nest and carrier glass. 2. The safety device according to claim 1, characterized in that the carrier glass is made with a groove for installation on the rod of the gamma-chamber SFA. 3. The safety device according to claim 1, characterized in that the carrier glass is made with a fixing step that prevents it from slipping off the gamma-chamber SFA rod. 4. The safety device according to claim 1, characterized in that the safety socket is made with a ledge restricting the movement of the gamma-chamber SFA when the rod breaks. 5. The safety device according to p. 1, characterized in that the safety socket is made with a leaf that can be rotated in a horizontal plane. 6. The safety device according to claim 1, characterized in that the safety socket is made with an emphasis restricting the rotation of the sash when it is closed. 7. The safety device according to claim 1, characterized in that the safety socket is made with a locking lever installed using a screw-nut pair and having the ability to move in a horizontal plane. 8. The safety device according to claim 1, characterized in that the locking lever is made with a counterweight. 9. The safety device according to claim 1, characterized in that the flexible connections are made in the form of chains and are attached to the carrier cup and safety nest using carbines. 10. The safety device according to claim 1, characterized in that the elements of the safety socket intended for attaching flexible connections are made with necks for grabbing the copy manipulator.

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